Damage assessment system

Abstract

To provide a disaster degree diagnosis system capable of easily diagnosing the degree of disaster at a low cost.SOLUTION: A disaster degree diagnosis system 10 includes: signal outputting devices 12a and 12b which are installed at installation places B1 and B2 in a non-structural body 36 of a building 30 and output signals corresponding to the degree of vibration generated at the installation places B1 and B2; and a diagnosis device 14 for analyzing the signals output from the signal outputting devices 12a and 12b, and diagnosing the degree of disaster of the building based on an analysis result of the signals.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a damage assessment system for a building, and more particularly to a damage assessment system that uses acceleration sensors and the like installed on non-structural members (secondary members) such as walls of a building. [Background technology]

[0002] Currently, when a building is damaged by an earthquake or the like, a damage assessment is carried out on the damaged building. The damage assessment determines the risk of collapse or the risk of exterior walls falling, etc., and evaluates the soundness of the building. For example, Patent Document 1 proposes a damage assessment method for a building in which acceleration sensors are placed on the column bases of each floor of the building and the inter-story deformation angle, which is the change in the vertical tilt angle before and after the earthquake, is directly monitored to determine the damage level of the building. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-203713 A Summary of the Invention [Problem to be solved by the invention]

[0004] As in the damage assessment method of Patent Document 1, acceleration sensors may be installed directly at predetermined positions on the structural frame, such as at the base of a column, foundation, or eaves. In this case, when attempting to perform a damage assessment on an existing building, it is necessary to temporarily remove non-structural elements (secondary members) such as walls when installing the acceleration sensors, which is extremely costly and time-consuming. Furthermore, depending on the structure of the existing building, it may not be possible to retrofit acceleration sensors to the base of a building's columns due to interference from installed non-structural elements, and as a result, it may not be possible to perform a damage assessment. Furthermore, when performing maintenance on an acceleration sensor installed on a column base, etc., it is necessary to temporarily remove non-structural elements (secondary members), which is also very costly and time-consuming, and also makes maintenance difficult.

[0005] Therefore, the present invention has been made in consideration of the above problems, and its object is to provide a damage assessment system that can perform damage assessment easily and at low cost. [Means for solving the problem]

[0006] The above problem is solved by the damage assessment system of the present invention, which includes a signal output device that is installed at a non-structural installation location of a building and outputs a signal corresponding to the degree of vibration occurring at the installation location; This problem is solved by having a diagnostic device that analyzes the signal output from the signal output device and diagnoses the damage level of the building based on the analysis result of the signal.

[0007] The damage assessment system of the present invention configured as described above can easily perform damage assessment at low cost.

[0008] Furthermore, in the above-mentioned damage assessment system, it is preferable that the assessment device has a band-pass filter set to satisfy the following conditions (1) and (2), and that the assessment device uses the band-pass filter to perform band-pass filtering on the signal from the signal output device and then analyze the signal. Condition (1): The transmission band of the bandpass filter must include the natural frequency of the location where the signal output device is installed. Condition (2): The feature quantity obtained by analyzing the band-pass filtered signal satisfies a predetermined standard. According to the above configuration, it is possible to remove noise and reduce accumulated errors, and also to grasp the behavior of the location where the signal output device is installed.

[0009] Furthermore, in the above-mentioned damage assessment system, there are at least two signal output devices, which are installed at a distance in the vertical direction of the building, and it is more preferable if the diagnostic device analyzes the signals from each of the signal output devices to obtain the horizontal displacement at the installation location of each signal output device, and obtains the inter-story displacement angle as the analysis result from the horizontal displacement at the installation location of each signal output device. According to the above configuration, it is possible to reliably measure the story displacement angle.

[0010] Furthermore, in the above-mentioned damage assessment system, if the building has a structural body and the structural body has an upper part and a lower part arranged on either side of the installation location in the vertical direction, the assessment device obtains the inter-story displacement angle using the distance between the upper part and the lower part, and it is even more preferable if the distance is longer than the installation interval of the signal output devices. According to the above configuration, it is possible to use the known distance between the structures to obtain the interlayer displacement angle.

[0011] Furthermore, in the above-described damage level assessment system, it is even more preferable that the signal output device is an acceleration sensor. According to the above configuration, it is possible to use a general-purpose product.

[0012] Furthermore, in the above-described damage assessment system, it is even more preferable that the non-structural elements of the building are interior walls. According to the above configuration, restrictions on the location of the signal output device are reduced, and it becomes possible to more easily diagnose the extent of damage. [Effects of the Invention]

[0013] According to the damage assessment system of the present invention, it is possible to carry out damage assessment easily and at low cost. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a schematic diagram illustrating an example of a damage assessment system according to an embodiment of the present invention. [Figure 2]10 is a graph showing an example of a bandpass filter used in the damage assessment system according to the embodiment of the present invention. [Figure 3] 10 is a graph showing an example of a story displacement angle obtained by an example of a damage assessment system according to an embodiment of the present invention. [Figure 4] 1 is a graph showing an example of an inter-story displacement angle of a structure. [Figure 5] FIG. 10 is a schematic diagram showing another example of a damage assessment system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] <<About a damage assessment system according to one embodiment of the present invention>> Hereinafter, one embodiment of the present invention (hereinafter referred to as the present embodiment) will be described with reference to the accompanying drawings. In the drawings, each component is shown somewhat simplified and schematic to make the explanation easier to understand, and the size (dimensions) of each component and the spacing between components shown in the drawings may differ from the actual ones. In the following explanation, a building will be used as a specific example. However, the building is not limited to an ordinary detached house, but also includes apartment buildings, such as low-rise apartments and condominiums. A detached house is a house having one, two, or three or more floors. The use of the building is also not particularly limited, and it may be a building used for purposes other than residential use, such as a store, facility, office, or building.

[0016] FIG. 1 is a schematic diagram showing an example of a disaster damage assessment system according to an embodiment of the present invention. The damage assessment system 10 shown in FIG. 1 includes signal output devices 12a and 12b and an assessment device 14 that assesses the damage level of a building 30. The assessment device 14 is made up of a general-purpose computer, and may be a client terminal such as a PC, or a server computer. The assessment device 14 may consist of one or more computers. The computer includes a CPU as a processor and a memory as a storage device, and is further equipped with a program for assessing the damage level.

[0017] Although the damage assessment system 10 in Fig. 1 has two signal output devices 12a and 12b, the number of signal output devices 12a and 12b is not particularly limited as long as the story displacement angle can be measured. However, it is preferable to have two or more signal output devices 12a and 12b, as this allows the story displacement angle to be measured reliably.

[0018] The building 30 that is the subject of the damage assessment has a structural part and a non-structural part 36. A lower part 32 and an upper part 34 are arranged on either side of a part of the non-structural part 36 (more specifically, the installation locations of the signal output devices 12a and 12b) in the height direction V. The lower part 32 and the upper part 34 constitute part of the structural part of the building, and include columns, beams, eaves beams, bearing walls (earthquake-resistant walls), slabs, foundations, and piles.

[0019] The structure including the lower portion 32 and the upper portion 34 is a member capable of exerting resistance to earthquakes and the like, and is also called a primary member. The lower portion 32 in Fig. 1 is, for example, the foundation of a building. The upper portion 34 is, for example, the eaves beam of the building. On the other hand, non-structural elements 36 are walls such as exterior walls and partition walls, floors, studs and beams, and are components attached to the structural elements. Non-structural elements 36 are non-structural parts that do not constitute the building's framework, and are components that are not expected to provide earthquake resistance on their own. Non-structural elements 36 are also called secondary elements. Of the non-structural elements 36, the part shown in Figure 1 is an interior wall 37. The height direction V is a direction perpendicular to the surface 32a of the lower portion 32. The heights H1, H2, and H3 below are all lengths in the height direction V.

[0020] The signal output device 12a is installed at an installation position B1 on the non-structural body 36 (indoor wall 37) of the building 30, and the signal output device 12b is installed at an installation position B2 higher than the installation position B1 on the non-structural body 36 (indoor wall 37) of the building 30. The signal output devices 12a and 12b are installed at a distance from each other in the height direction V of the building 30. The installation position B1 of the signal output device 12a is at a height H1 from the surface 32a of the lower portion 32 (foundation). The height H1 is preferably 250 mm or less. The installation location B2 of the signal output device 12b is at a height H3 from the surface 34a of the upper portion 34 (eaves beam). The height H3 is preferably 220 mm or less. The installation location B2 of the signal output device 12b is at a height H2 from the surface 32a of the lower portion 32 (foundation), and the height H2 is preferably 2200 mm or more. It is preferable that the height H1 is 250 mm or less and the height H2 is 2200 mm or more, as this is a sufficient distance for measuring the story displacement angle. Furthermore, by installing the signal output devices 12a and 12b on the indoor wall 37, the non-structural element 36 is an indoor wall 37, which reduces restrictions on installation locations and makes it easier to diagnose the extent of damage.

[0021] The signal output devices 12a and 12b output signals corresponding to the degree of vibration occurring at the installation location, and for example, acceleration sensors are used. The type of acceleration sensor is not particularly limited, and capacitive and piezo-resistive types can be used. By using an acceleration sensor, it is possible to use general-purpose products for the signal output devices 12a and 12b. The signal output devices 12a and 12b are connected to the diagnostic device 14, but the connection method is not particularly limited and may be wired or wireless. Wireless methods include methods via the Internet. Alternatively, the signal output devices 12a and 12b may output signals to a specific server on a network, where the signals are stored, and the diagnostic device 14 may access the specific server to acquire the signals from the signal output devices 12a and 12b.

[0022] Furthermore, the signal output devices 12a and 12b and the acceleration sensor can be installed at the installation location using screws, adhesive, magnets, or the like. Other installation methods for the signal output devices 12a and 12b are also possible. For example, the signal output devices 12a and 12b may be devices that can be connected to electrical outlets installed in a building. For example, the signal output device 12a may be connected to an outlet installed on the lower side of a wall, and the signal output device 12b may be connected to an upper outlet to which an air conditioner or refrigerator is connected. In this case, it is preferable that the signal output devices 12a and 12b are supplied with power from the building's power source (more specifically, a commercial power source connected to the building) and, when the power supply is interrupted, are supplied with power from batteries or the like internal to the signal output devices. This reduces the frequency of battery replacement and improves maintainability.

[0023] The diagnosing device 14 analyzes the signals output from the signal output devices 12a and 12b, and diagnoses the damage level of the building based on the analysis results of the signals. The diagnostic device 14 has an analysis unit 16, a determination unit 18, a memory unit 20, and a control unit 22. These functional units are realized by the cooperation of the hardware devices and software (specifically, a program for diagnosing the degree of damage) of the computer that constitutes the diagnostic device 14. The diagnostic device 14 also has a display unit 24. The control unit 22 controls the operations of the analysis unit 16, the determination unit 18, the memory unit 20, and the display unit 24. Hereinafter, unless otherwise specified, the analysis unit 16, the determination unit 18, the memory unit 20, and the display unit 24 are controlled by the control unit 22. The analysis unit 16 is connected to the signal output devices 12a and 12b via the above-mentioned wired or wireless method. The analysis unit 16 analyzes the signals, such as acceleration signals, output from the signal output devices 12a and 12b, and obtains the story displacement angle as the analysis result. The measurement of the story displacement angle will be explained later.

[0024] The determination unit 18 determines the degree of damage based on the inter-story displacement angle. For example, the relationship between the magnitude of the inter-story displacement angle and the degree of damage is set in advance and stored in the memory unit 20. The determination unit 18 reads out the relationship between the magnitude of the inter-story displacement angle and the degree of damage from the memory unit 20 and determines the degree of damage based on the obtained inter-story displacement angle. The determination unit 18 outputs the determination result of the degree of damage to, for example, the memory unit 20 and stores it in the memory unit 20. In addition, the judgment unit 18 is not particularly limited to a judgment method as long as it can judge the degree of damage based on the inter-story displacement angle, and can appropriately use a known judgment method of the degree of damage based on the inter-story displacement angle.

[0025] The memory unit 20 stores the relationship between the magnitude of the story displacement angle and the damage level as described above. It also stores the determination results as described above. The signals output from the signal output devices 12a and 12b may be stored in the memory unit 20. In this case, the analysis unit 16 reads out the signals output from the signal output devices 12a and 12b from the memory unit 20 and performs analysis.

[0026] The display unit 24 displays the determination result of the determination unit 18, and has a display panel such as a liquid crystal panel or an organic EL panel. The method for displaying the determination result is not particularly limited, and for example, the damage level is evaluated numerically, with the lowest damage level being 1 and the numerical value increasing according to the damage level. The numerical value according to the damage level is displayed on the display unit 24. Furthermore, the degree of damage is classified by color, and the color corresponding to the degree of damage is displayed on the display unit 24. In this case, the display unit 24 may be configured to have a plurality of types of single-color light-emitting elements instead of a display panel, and the light-emitting elements are caused to emit light in a color corresponding to the degree of damage. The display unit 24 may be integrated with or separate from the diagnostic device 14. If separate, the connection between the display unit 24 and the diagnostic device 14 is not particularly limited, but may be wired or wireless.

[0027] Furthermore, the determination result of the determination unit 18 may be output to, for example, a specific website or a specific server other than the display unit 24. In this case, the determination result of the determination unit 18 can be obtained by accessing the specific website or the specific server. The determination result of determination unit 18 may also be transmitted to a mobile terminal such as a smartphone. When the determination result of determination unit 18 is output to the outside in this manner, diagnostic device 14 is configured to include a transmission unit (not shown). The transmission unit is not particularly limited as long as it can output the determination result of determination unit 18 to, for example, a specific website, a specific server, or a mobile terminal such as a smartphone, as described above, and any known transmission unit that can connect to the Internet and output information can be used as appropriate.

[0028] Next, the analysis of the signals output from the signal output devices 12a and 12b by the analysis unit 16 will be described. The analysis unit 16 performs second-order integration on the signals (more specifically, acceleration signals) output from the signal output devices 12a and 12b to obtain the displacement in the horizontal direction D at the installation locations B1 and B2 of each of the signal output devices 12a and 12b. Thereafter, the analysis unit 16 obtains the inter-story displacement angle as the analysis result from the displacement in the horizontal direction D at the installation locations B1 and B2 of each of the signal output devices 12a and 12b. The horizontal direction D is a direction orthogonal to the height direction V described above, and is a direction parallel to the surface 32a of the lower portion 32. The horizontal direction D is also a direction perpendicular to the installation locations B1 and B2. In the configuration of building 30 shown in Fig. 1, the story displacement angle is obtained using the displacement in the horizontal direction D at installation location B1 of signal output device 12a, the displacement in the horizontal direction D at installation location B2 of signal output device 12b, and the distance H between lower part 32 and upper part 34 in the height direction V. The story displacement angle is used when determining the damage level at a required position of the structure by determination unit 18.

[0029] The distance H is the length in the height direction V between the reference position A1 of the lower part 32 (foundation) and the reference position A2 of the upper part 34 (eaves beam). The distance H is longer than the installation interval (H2-H1) between the signal output devices 12a and 12b. When the inter-story displacement angle is δ, the displacement in the horizontal direction D at the installation location B1 where the signal output device 12a is installed is d1, and the displacement in the horizontal direction D at the installation location B2 where the signal output device 12b is installed is d2, the inter-story displacement angle δ can be calculated using the formula δ=(d2-d1) / H. As mentioned above, the story displacement angle is not calculated using the installation distance (H2-H1) between the signal output devices 12a and 12b. In other words, when calculating the story displacement angle, a reference position of a part of the structure, such as the eaves beam or foundation, is usually used. In this embodiment, the same reference position is also used when calculating the story displacement angle. The distance H is known and can be specified from the blueprints of the building 30, but it may also be an actual measurement value. In this way, the known distance H between the structures can be used to obtain the story displacement angle.

[0030] Generally, to obtain displacement by second-order integration of the acceleration sensor output value, appropriate band-pass filtering is performed before the second-order integration to remove noise. For example, the displacement obtained by second-order integration of the acceleration sensor output value without noise processing is likely to be significantly different from the actual displacement due to increased accumulated error. Therefore, it is preferable for the analysis unit 16 to perform band-pass filtering to remove noise. The analysis unit 16 performs band-pass filtering on the signals output from the signal output devices 12a and 12b and then analyzes the signals. A band-pass filter, as described below, is used for the band-pass filtering. Furthermore, known signal processing can be used as appropriate for the band-pass filtering, and therefore a detailed description thereof will be omitted.

[0031] Furthermore, it is preferable that the diagnostic device 14 has a band-pass filter set to satisfy the following conditions (1) and (2), and that the diagnostic device 14 performs band-pass filtering on the signal from the signal output device using the band-pass filter, and then analyzes the signal. Condition (1): The transmission band of the bandpass filter must include the natural frequency of the location where the signal output device is installed. Condition (2): The feature quantity obtained by analyzing the band-pass filtered signal satisfies a predetermined standard.

[0032] Fig. 2 is a graph showing an example of a bandpass filter used in the damage assessment system according to an embodiment of the present invention. In Fig. 2, the vertical axis represents signal transmittance (unit: dimensionless) and the horizontal axis represents frequency (unit: Hz). The bandpass filter 40 passes frequencies from 0.25 Hz to 30 Hz. However, the bandpass filter 40 is not limited to the one shown in Fig. 2. As in the above-mentioned condition (1), the passband of the bandpass filter preferably includes the natural frequency of the installation location of the signal output devices 12a and 12b and has the characteristic of passing a band including the natural frequency of the installation location. This makes it possible to grasp the behavior of the installation location of the signal output devices 12a and 12b. Furthermore, by configuring the bandpass filter to pass a band including the natural frequency of the installation location of the signal output devices 12a and 12b, it is possible to set the bandpass filter according to the vibration characteristics of the building. Therefore, it is possible to obtain the story displacement angle by reflecting the vibration characteristics of non-structural elements (secondary members) at the installation location of the signal output devices 12a and 12b, and ultimately to more appropriately determine the damage level.

[0033] In a bandpass filter, for example, the low-pass side is set so as not to cut off the natural frequency of a partition wall, for example, around 20 Hz, so that the behavior of non-structural elements such as partition walls can be understood. For this reason, to be on the safe side, the low-pass side is set to a frequency of 30 to 60 Hz. For example, the low-pass side of the bandpass filter 40 shown in Figure 2 is 37.5 Hz. The high-pass filter is not particularly limited because it does not have much effect on the displacement calculation.

[0034] Furthermore, as shown in the above-mentioned condition (2), the band-pass filter is set so that the feature obtained by analyzing the band-pass filtered signal satisfies a predetermined criterion. The feature in condition (2) is the story displacement angle, and the predetermined criterion is that the story displacement angle matches the story displacement angle calculated from the displacement measured by the laser displacement meter, and that the relative error of the maximum story displacement angle is less than ±10%. More specifically, the bandpass filter is set on the high-pass side so that the inter-story displacement angle, which is a feature quantity, matches the inter-story displacement angle calculated from the measurement value of the laser displacement meter. The measurement value of the laser displacement meter is the displacement between the steel frame position and the eaves beam position measured by the laser displacement meter. The high-pass side is then set so that the inter-story displacement angle obtained by analyzing the bandpass filtered signal (i.e., the inter-story displacement angle calculated from the acceleration data of two acceleration sensors installed on the interior wall 37) matches the inter-story displacement angle calculated from the measurement value of the displacement between the steel frame position and the eaves beam position. Furthermore, the bandpass filter is set so that the absolute value of the relative error of the maximum story displacement angle is less than 10%. The target for setting the bandpass filter is, for example, that the absolute value of the relative error of the maximum story displacement angle is less than 10% and that the displacement waveform calculated from the acceleration sensor data at the height H1 (250 mm from the foundation) has converged. Note that the convergence of a displacement waveform means that the displacement waveform becomes smaller over time and eventually reaches 0, or that the displacement waveform fluctuates between values ​​infinitely close to 0, with 0 as its center. The convergence of a displacement waveform does not mean that the displacement waveform becomes larger over time.

[0035] Next, the layer displacement angle will be described in more detail. Fig. 3 is a graph showing an example of a story displacement angle obtained by an example of a damage assessment system according to an embodiment of the present invention, showing the change in story displacement angle over time. Fig. 4 is a graph showing an example of a story displacement angle of a structure, showing the change in story displacement angle over time. In Figs. 3 and 4, the vertical axis represents the story displacement angle (unit: dimensionless) and the horizontal axis represents time (unit: seconds). As can be seen by comparing waveform 42 showing the change in story drift angle over time in Figure 3 with waveform 44 showing the change in story drift angle over time in Figure 4, the story drift angles obtained by an example of a damage assessment system and the story drift angles of the structure are roughly consistent in waveforms 42 and 44. Furthermore, between the story drift angles obtained by an example of a damage assessment system and the story drift angles of the structure, the maximum story drift angle has a relative error of about 3%, and the minimum story drift angle has a relative error of about 13%. The standard for relative error is the story drift angle between the foundation and eaves beam positions. From the above, it can be seen that the damage assessment system 10 is able to properly determine the damage level. Furthermore, in the damage assessment system 10, the signal output devices 12a, 12b such as acceleration sensors can be installed on the interior wall 37 (see FIG. 1), and there is no need to install them on the structural components of the foundation (lower portion 32) and eaves beam (upper portion 34), so installation of the signal output devices 12a, 12b is not time-consuming and damage assessment can be carried out easily and at low cost. Furthermore, because the signal output devices 12a, 12b can be installed on the interior wall 37 (see FIG. 1), there is no need to temporarily remove non-structural components (secondary members), which saves cost and time and allows for good maintainability.

[0036] <<Other embodiments>> Although one embodiment of the damage assessment system of the present invention has been described above, the above embodiment is merely an example for facilitating understanding of the present invention and does not limit the present invention. In other words, the present invention can be modified and improved without departing from the spirit and scope of the present invention. Furthermore, the present invention naturally includes equivalents thereof.

[0037] Another embodiment of the present invention will now be described. FIG. 5 is a schematic diagram showing another example of a damage assessment system according to an embodiment of the present invention. In FIG. 5, the same components as those shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted. The building 31 shown in Figure 5 is a two-story building that differs from the building 30 shown in Figure 1 in that the structure has three sections of different heights: a lower section 32, an upper section 34, a top section 35, and two interior walls 37a and 37b. The lower section 32 is the foundation, the upper section 34 is the first-floor ceiling beam, and the top section 35 is the eaves beam. An interior wall 37a is provided between the lower section 32 and the upper section 34, and an interior wall 37b is provided between the upper section 34 and the top section 35.

[0038] In building 31, signal output devices 12a and 12b are installed on indoor wall 37a in the same manner as in building 30. On indoor wall 37b, signal output device 12c is installed at installation position B3, and signal output device 12d is installed at installation position B4. The installation locations of the signal output devices 12a and 12b on the indoor wall 37a and the installation locations of the signal output devices 12c and 12d on the indoor wall 37b may be the same, for example, but are not limited to this and will depend on the configuration of the building 31. On the indoor wall 37b, the installation position B3 of the signal output device 12c is also at a height H1 from the upper surface 34b of the upper portion 34. The height H1 is preferably 250 mm or less. The installation location B4 of the signal output device 12d is at a height H3 from the surface 35a of the uppermost part 35. The height H3 is preferably 220 mm or less. The installation location B2 of the signal output device 12c is at a height H2 from the top surface 34b of the upper part 34, and the height H2 is preferably 2200 mm or more. It is preferable that the height H1 is 250 mm or less and the height H2 is 2200 mm or more, as this provides a sufficient distance for measuring the inter-story displacement angle.

[0039] For the building 31, similarly to the above-described building 30, the story displacement angle can also be obtained using the distance H between the reference position A1 of the lower part 32 and the reference position A2 of the upper part . Furthermore, for building 31, the story displacement angle can also be obtained using the distance H4 between reference position A2 of upper part 34 and reference position A3 of the topmost part 35. In this case, the signal from signal output device 12c and the signal from signal output device 12d are used to calculate the story displacement angle. Furthermore, for building 31, the story displacement angle can also be obtained using the distance H5 between reference position A1 of lower portion 32 and reference position A3 of uppermost portion 35. In this case, the signal from signal output device 12a and the signal from signal output device 12d are used to calculate the story displacement angle. The distance H4 is the length in the height direction V between the reference position A2 of the upper part 34 and the reference position A3 of the uppermost part 35. The distance H5 is the length in the height direction V between the reference position A1 of the lower part 32 and the reference position A3 of the uppermost part 35. As described above, for the building 31, the story displacement angle can be obtained at the required position of the structure, and the determining unit 18 can determine the damage level at the required position of the structure. In addition, in the above embodiment, building 30 is one-story and building 31 is two-story, but the buildings targeted by the damage assessment system of the present invention are not limited to this and can also be applied to multi-story buildings with three or more stories. [Explanation of symbols]

[0040] 10. Damage Assessment System 12a, 12b, 12c, 12d signal output device 14 Diagnostic equipment 16 Analysis Department 18 Judgment section 20 Memory section 22 Control Unit 24 Display section Buildings 30 and 31 32 Lower part 34 Upper part 35 Top part 32a, 34a, 35a surface 34b Top surface 36 Non-structural 37, 37a, 37b Indoor wall 40 Bandpass Filter 42, 44 waveform A1, A2, A3 reference position B1, B2, B3, B4 installation locations D horizontal direction H distance H1, H2, H3 height H4 and H5 distances V Height direction

Claims

1. a signal output device that is installed at a location in a non-structural part of the building and outputs a signal according to the degree of vibration occurring at the location; a diagnosis device that analyzes the signal output from the signal output device and diagnoses the damage level of the building based on the analysis result of the signal, There are at least two signal output devices, and the signal output devices are installed spaced apart in a height direction of the building, the diagnostic device analyzes the signals from the signal output devices to obtain horizontal displacements at the installation locations of the signal output devices, and obtains an inter-story displacement angle as the analysis result from the horizontal displacements at the installation locations of the signal output devices; A damage assessment system in which the building has a structural body, and when the structural body has an upper part and a lower part arranged on either side of the installation location in the height direction, the diagnostic device obtains the inter-story displacement angle using the distance between the upper part and the lower part, and the distance is longer than the installation interval of the signal output devices.

2. The diagnostic device has a bandpass filter set to satisfy the following conditions (1) and (2): The damage assessment system according to claim 1 , wherein the assessment device performs band-pass filtering on the signal from the signal output device using the band-pass filter, and then analyzes the signal. Condition (1): The transmission band of the band-pass filter includes the natural frequency of the location where the signal output device is installed. Condition (2): The feature quantity obtained by analyzing the signal that has been band-pass filtered satisfies a predetermined standard.

3. The disaster damage assessment system according to claim 1 or 2, wherein the signal output device is an acceleration sensor.

4. The damage assessment system according to any one of claims 1 to 3, wherein the non-structural element of the building is an interior wall.

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